Protecting-sleeve for screw-propeller shafts.



No. 810,187. PATENTED JAN. 16, 1906. F. R. GEDERVALL, DECD. 0. w.OEDBRVALL, ADMINISTRATOR.

PROTECTING SLEEVE FOR SCREW PROPELLER SHAFTS.

APPLIGATIONIILED APR. 8.1904.

Witnesses new I CM #M UNITED STATES PATENT OFFICE.

TRATOR, or FRANS REINHOLD GEDERVALL, DECEASED.

PROTECTING-SLEEVE FOR SCREW-PROPELLER SHAFTS.

Specification of Letters Patent.-

Patented Jan. 16, 1906.

Application filed April 8, 1904. Serial No. 202,199-

To all whmn it may concern:

Be it known that I, CARL WILHELM CE- DERVALL, a subject of the King ofSweden and Norway, Sweden, am the administrator of the estate of FnANsRErNHoLD OEDERVALL, deceased, and that the said F. R. CEDERVALL didinvent new and useful Improvements in Protecting- Sleeves forScrew-Propeller Shafts, of which the following is a specification,reference being had to the drawings accompanying and forming a parthereof.

This invention relates to improvements in protecting-sleeves forscrew-propeller shafts.

I For the purpose of protecting that part of screw-propeller shaftswhich is outside of the bushing in the stern-post against the corrosiveinfluence of salt water special protectingsleeves are in many casesused. composed of two rings movable in relation to each other. The onering of such protecting-sleeves is rigidly secured to the boss of thescrew-propeller, while the other ring, having the shape of an annularpiston, engages an annular groove or recess in the first-mentioned ringand is pressed. against the end surface of the bushing in the stern-postby means of springs, so as to tighten against the said end surface. Ithas been found in using such protectingsleeves that it is not possiblein every case to provide at the same time a suflicient adjustment of thesleeve and a constant pressure between the said piston and the end ofthe shaftbushing. This disadvantage is greatest when a new propeller isto be secured to the shaft, in which case it frequently happens that onaccount of inaccuracy in manufacture the new propeller does not fit theshaft at the same position as the old one. In such cases it is oftendesirable that the sleeve be adjustable within comparatively wide limitsin order to obviate the tedious work of fitting the propeller on theshaft.

In accordance with the present invention the said increasedadjustableness is obtained by having one or both of the said rings madein at least two parts which are movable or slidable in relation to eachother. By this construction the length of the sleeve may be adjusted inaccordance with the length of the space between the end of theshaft-bushing in the stern-post and the propeller within wider limitsthan heretofore, while at the and a resident of Gothenburg,

drawings.

same time maintaining a constant pressure of the springs.

In the accompanying drawings is shown one constructional form of theinvention.

Figure 1 is an end view of the improved protecting-sleeve, and Fig. 2 isa section of the same on line A B in Fig. 1.

Referring to the drawings, 1 represents the ring, which is adapted to besecured to the boss of the propeller, while 2 represents the annularpiston, which by means of springs 3 is adapted to be pressed against theend of the shaft-bushing, The said ring 1 is made in two ring-shapedparts 4 and 5, of which the part 4 is adapted to be directly secured tothe boss of the propeller, while the part 5 is screwed on the part 4 andsupports the annular piston 2, together with the springs 3 and apacking-ring 6 for the said piston.

In order to enable the rings 4 and 5 to be adjusted in relation to eachother in a simple manner for varying the length of theprotecting-sleeve, a ring 7 is rotatably but not slidably arranged onthe said part 4, the said ring 7 being divided and provided with aninwardly-extending flange and axially-runj 8, in which enter pins 9 orthe like, secured to the part 5. When the said part 7 is rotated, thepart 5 will thus be displaced on the part 4 in the one direction or theother or unscrewed from the said part 4. In order to prevent the waterfrom entering between the parts 4 and 5, a packing ring or rings 10 isor are provided between the same.

Obviously the adjustment of the parts 4 and 5 in relation to each othermay be effected by other means than those shown in the For instance, thering 7 may be screwed on the part 4 and engage by means of an annularflange or the like a corresponding annular groove on the part 5, inwhich case the latter is arranged slidably relative to the part 4.Instead of two rings adjustable in relation to each other a largernumber of such rings may be used, whereby the degree of adjustment maybe correspondingly in creased. The annular piston 2 may be made in twoor more parts slidable in axial direction in relation to each other forthe purpose set forth.

Having now described the invention and in what manner the same maybeperformed, what is claimed is- 1. A protecting-sleeve forscrew-propeller shafts adapted to protect the part of the latter outsideof the bushing in the stern-post and comprising rings adustable inrelation to each other, a piston-like ring fitted into an annularopening in one of said rings, and springs adapted to press the saidpiston-like ring outwardly from its seat, and for the purpose set forth.

2. A protecting-sleeve for screw-propeller shafts comprising two ringsprovided on the shaft and serving to protect that part of the same whichis outside of the bushing in the stern-post, one of said ringsfitted'into the other and adjustable thereon; a piston-like ring fittedinto an annular opening in the larger ring; and springs interposedbetween the piston-like ring and its seat on the larger ring to pressthe former outwardly from the latter, substantially as described andshown.

3. A protecting-sleeve for screwpropeller shafts comprising two ringsprovided on the shaft and serving to protect that part of thesubstantially as an annular opening in the larger ring; springsinterposed between the piston-like ring and its seat on the larger ringto press the former outwardly from the latter; an outer ring providedwith an inwardly-extending flange and grooves and surrounding saidlarger ring, the larger ring being provided with a shoulder and pinswhich cooperate with the flange and grooves of the outer ring,substantially as and for the purpose described and shown.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

CARL WILHELM CEDERVALL,

Aohm'nistv'atm' 0f the estate of Frans Reinhold OBdBT'UCLZZ, deceased.

Witnesses:

OTTo RICHARD SWERRE, CARL EDVIN OLOF OLLfiN.

